#[cfg(test)]
mod tests;

mod camera {
    use crate::screen::{Camera, WORLD_HALF_EXTENTS};
    #[test]
    fn camera_is_to_scale_and_transforms_properly() {
        // The camera is a projection from [-WHE, +WHE] to [0, 1]
        let mut camera = Camera {
            width: WORLD_HALF_EXTENTS.x as f32,
            height: WORLD_HALF_EXTENTS.y as f32,
            ..Default::default()
        };
        let vpjm = camera.build_view_projection_matrix();
        assert_eq!(
            vpjm.project_point3(glam::Vec3::new(0.0, 0.0, 0.0)),
            glam::Vec3::new(0.5, 0.5, 0.0)
        );
        assert_eq!(
            vpjm.project_point3(glam::Vec3::new(1.0, 1.0, 0.0)),
            glam::Vec3::new(1.0, 1.0, 0.0)
        );
        camera.transform.translation.x = -0.25;
        camera.transform.translation.y = -0.25;
        let vpjm = camera.build_view_projection_matrix();
        assert_eq!(
            vpjm.project_point3(glam::Vec3::new(0.0, 0.0, 0.0)),
            glam::Vec3::new(0.25, 0.25, 0.0)
        );
        assert_eq!(
            vpjm.project_point3(glam::Vec3::new(1.0, 1.0, 0.0)),
            glam::Vec3::new(0.75, 0.75, 0.0)
        );
    }
}